Spark-plug.



J. G. WESTBROOK.

SPARK PLUG.

APPLICATION FILED SEPT.25, 1913.

Patented Feb. l2, 1915.

no Zw@ IQ.

3 nventor witnesses attorneys UNITED sTATEs PATENT oEEicEL.

4.niiiiEs G. 'wEsTERooin or oeiiENs'BUae, NEW Yoan.

SPARK-PLUG.

mensen To all whom t may concern Be it known that I, JAMES Ogdensburg, in the count of St. Lawrence and State ofNew York, ave invented certain new and useful Improvements in Spark- Plugs; `andI do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make' and use the same.

This invention relates to spark, plugs, and

:an object of ythe invention is. to provide for heating, confining and compressing a small part bf thecharge in a radiator separated by a fine screen from the gas engine cylinder so that said'cliarge may be exploded by the vspark, whereupon a charge in the-cylinder tions, combinations .and arrangements vof parts as will be hereinafter more fully demay be exploded by the smaller charge ignited by the spark lug. I g

Another object of) the inventionis to retain the heat of the explosion and prevent disastrous alternate heating and cooling of the breakable parts ofthe spark plug.

A further object of the invention is to provide means for safe-guarding the electrodes against carboniz'ation, which is almost certain to take pla'ce in the best regulated of engines.

With these and other objectsv in view the invention comprises certain vnovel construcscribed and claimed. f

' The accompanying drawing shows a, section through the plug and adjacent parts of the cylinder, but I wish it to be understood that any form of spark plug may be used,

either high or ,low tension, withoutv departing from the principle involved inthe invention, although I have chosen to show a high tension spark plug in connection with the, invention.

I am aware that it proposed to extend from the spark plug .fa

- tube which projects into' the cylinder and vproposed to arrange -a cap'over the sparkV plug to house the electrodes, the cap being has located therein the electrodes of the plug, butinalmost every instance the elecytrodes are placed adjacent the lower end'of.

the tube. I am also aware ,that it has been provided with perfor-ations admitting the passage of gasto be ignited, but theseperforations'have been so large as to offer practically no resistance to the accumulation of Specification of Letters Patent G. WEs'rBRooK, a citizen of the-United States, residing at' has been heretofore Patented Feb. e, 1915.

` Application led September 25, 1913. Serial No. 791,847.

carbon upon the spark plug electrodes. The present invention aims to provide-a tube, the

upper end of which housesr the electrodes .L

v while the lower end is closed with a fine A.shape and of the proper size to'house the desired amount of charge, has the lower end thereof closed with a screen 7 which may be a 50 mesh screen or finer. This screen may befsecured to the lower orinner end of the tube in any. manner, but preferably it is inclosed within a ring 9 which is screwed ontov external threads on the tuber 6.-

IIt is desirable to have the electrodes 8 located at the upper or outerend of the tube, so that thel spark will be effective in exploding the gas which is compressed within the tube rather than exploding directly the mixture within the cylinder outside the tube.

lower end of the It will be apparent that the tube forms a protection to the porcelain or other fragile partsof the plug, lin lthat it prevents direct contact of said lfragile parts with the scavenging 'air,'aiid that inasmuchas the greater part of the tube stands away from the wall of the cylinder the cooling of the cylinder by its jacket or otherwise will not lreduce the temperature of the tube to any appreciable extent, so that when the mixture is compressed that part which is forced into the tube will be heated to` a temperature higher than^that in the cylinder and the explosion for this reason facilitated. Hencey it may be said that the tube yserves as a radiator which 'remains always sufficiently hot to warm that part of the charge within it and immediately next 'to the ter-' 105 purpose of preventirug' fica-ting particles of j minals of the. plug. The screen 7 is for the carbon which are formed at the time of explosion or immediately thereafter' from passing into t e tube and from being deosited upon the electrodes 8. The' screen is of extremely fine mesh, and I have found that if it is between 60 and 160 gage no `oil lgathers on the electrodes, nor moistureI -thegas 1n thecylinder at the instant of ex plosion and the smaller conned charge thereupon ignites the charge in the cyl-g inder.l As the charge in the c linder immediately adjacent the tube will e hotter than the-'charge remote from the tube, the ame of the exploding confined charge passing through the screen will ignite the charge in the cylinder. v

I am aware that at the time of an ex-v plosion carbon forms in the cylinder in the form of an impalpable powder and that immediately thereafter these articles collect to form large particles w ich may become incandescent or be objectionab1e,.andf it is these larger particles'which are to be excluded from contact with the electrodes by the screen.' i

WhatIclaimis:

1. The combination with an internal combustion engine cylinder, and a s ark plug v in its head; of a hollow metallic e ement sement having an opening into the interior of the cylinder` at a oint remote from' said 30 electrodes, 'and ,a such o ening.

2. T e combination `With-an internal combustion .engine cylinder having ay threaded hole in its head, and a spark plug carried by said head with its electrodes projecting e mesh screen across into said hole; of a tubular metallic el'e-A ment having its upper end screwed into said hole in its head, and a spark plug 'screwed partwayinto said hole; of a tubescrewed into the inner end of the hole against the innerend of the plug and' inclosing the elecvtrodeSt-hereof, its body pro]ecting for an appreciable distance ,into the cylinder, and

a screen of extremely line mesh across the inner end of the tube.

In testimony whereof I aiiix Imy signature in ,presence of two witnesses. A

l .uns/IESA G. v VEsTBRooK. Witnesses :l i i l IDA MAY MORELAND, T. J. HOUSTON. c 

